MCP TypeScript client SDK: HTTP client transports and OAuth requests followed cross-origin redirects and re-sent custom headers and request bodies

Summary In affected versions, the SDK's HTTP client transports and OAuth requests followed redirects to any origin. If an MCP server or authorization server redirected a request to another origin, that origin received custom request headers such as an X-API-Key set in requestInit.headers and the...

SUSE CVE-2026-64684

RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.1.0, the rmcp crate's StreamableHttpClientTransport in crates/rmcp/src/transport/common/reqwest/streamablehttpclient.rs builds its defaulthttpclient with reqwest's automatic redirect policy and applies caller-supplied values...

GHSA-9G45-5XWM-F3WC RMCP: Custom HTTP headers leak to cross-origin redirect targets

Summary The rmcp crate's StreamableHttpClientTransport forwards caller-supplied custom HTTP headers such as X-API-Key, X-Auth-Token, Api-Key to cross-origin redirect targets. The defaulthttpclient function builds a reqwest::Client without a redirect policy override, so the default limited10 polic...

RMCP: Custom HTTP headers leak to cross-origin redirect targets

Summary The rmcp crate's StreamableHttpClientTransport forwards caller-supplied custom HTTP headers such as X-API-Key, X-Auth-Token, Api-Key to cross-origin redirect targets. The defaulthttpclient function builds a reqwest::Client without a redirect policy override, so the default limited10 polic...

EUVD-2026-81266

RMCP: Custom HTTP headers leak to cross-origin redirect targets...

Linux Distros Unpatched Vulnerability : CVE-2026-64684

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.1.0, the rmcp crate's StreamableHttpClientTransport in...

CVE-2026-64684

RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.1.0, the rmcp crate's StreamableHttpClientTransport in crates/rmcp/src/transport/common/reqwest/streamablehttpclient.rs builds its defaulthttpclient with reqwest's automatic redirect policy and applies caller-supplied values...

CVE-2026-64684 RMCP: Custom HTTP headers leak to cross-origin redirect targets

RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.1.0, the rmcp crate's StreamableHttpClientTransport in crates/rmcp/src/transport/common/reqwest/streamablehttpclient.rs builds its defaulthttpclient with reqwest's automatic redirect policy and applies caller-supplied values...

CVE-2026-64684

RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.1.0, the rmcp crate's StreamableHttpClientTransport in crates/rmcp/src/transport/common/reqwest/streamablehttpclient.rs builds its defaulthttpclient with reqwest's automatic redirect policy and applies caller-supplied values...

CVE-2026-64684 RMCP: Custom HTTP headers leak to cross-origin redirect targets

RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.1.0, the rmcp crate's StreamableHttpClientTransport in crates/rmcp/src/transport/common/reqwest/streamablehttpclient.rs builds its defaulthttpclient with reqwest's automatic redirect policy and applies caller-supplied values...

CVE-2026-64684

RMCP , the official Rust SDK for the Model Context Protocol, is affected in StreamableHttpClientTransport (prior to version 2.1.0). The custom_headers configured via StreamableHttpClientTransportConfig are applied to the reqwest client without being marked as sensitive. When a malicious or compro...

CVE-2026-64684 RMCP: Custom HTTP headers leak to cross-origin redirect targets

RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.1.0, the rmcp crate's StreamableHttpClientTransport in crates/rmcp/src/transport/common/reqwest/streamablehttpclient.rs builds its defaulthttpclient with reqwest's automatic redirect policy and applies caller-supplied values...

CVE-2026-64684: Exposure of Sensitive Information to an Unauthorized Actor

RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.1.0, the rmcp crate's StreamableHttpClientTransport in crates/rmcp/src/transport/common/reqwest/streamablehttpclient.rs builds its defaulthttpclient with reqwest's automatic redirect policy and applies caller-supplied values...

PT-2026-94090

Name of the Vulnerable Software and Affected Versions rmcp versions prior to 2.1.0 Description The StreamableHttpClientTransport in the rmcp crate fails to mark caller-supplied custom HTTP headers as sensitive and uses a default HTTP client with an automatic redirect policy. When a compromised or...